Adjustable mounting of armatures of electromagnets.



. E. B. CRAFT. ADJUSTABLE MOUNTING 0F ARMATURES of ELBCTROMAGNETS.APPLICATION FILED MAY 7, 1908.

1,096,287, Patented May 12, 1914.

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EDWARD B. CRAFT, OF NEW YORK. N. Y., ASSIGNOR TO WESTERN ELECTRICCOMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

ADJUSTABLE MOUNTING OF ARMATURES OF ELECTROMAGNETS.

Specification of Letters Patent.

Patented .May 12, 1914.

Application led May 7, 1908. Serial No. 431,329.

To all 'whom it may concern:

Be it known that I, EDWARD B. CRAFT, citizen of the United States,residing at New York, in the ycounty of New York and State of New York,have invented a certain new anduseful Improve-ment in AdjustableMounting 'of Armatures of Electromagnets, of which the following is afull, clear, conoise, and exact description.

yHy invention relates more particularly to the manner of mounting thearmature, together with the meansl for adjusting the same with respectto the poles of the electromagnet inlpolarized ringers.

Heretofore, polarized ringers for telephone calls and other uses havebeen provided with two' spools with projecting poles upon which has beenmounted a link, which link has served as a support for the part or yokecarrying the armature, and means have been provided in connectiontherewith for adjusting the said bridge and thereby the armature towardor away from the ends ofthe poles.

In m preferred construction, the link consists ofY a plate having itsends forked or bifurcated to fit into annular grooves or slots providedin the projecting ends of the electromagnet poles. As a means forsecuring the link in said slots, the link is bent or curved slightly asshown in Figure 7, so that when placed in position and pressure applied,it will be securely clamped in position upon the extension. of themagnet cores', or tongues may be cut therein in such way as to make surethat the link will be held firmly in position 'without yielding andwithout liability of becoming loose or in any way displaced after theparts are assembled. A bridge of spring met-al upon' which the armatureis pivoted is mounted upon the ends of the. forks of the link. By meansof a screw passing through the center of this bridge and through aperforation provided for the purpose in the armature, and into thecentral part of the link, the bridge or U-shaped member may be iieXedtoward or away from the link, thereby adjusting the position of thearmature, which comes between the bridge and the link, toward or awayfrom the said poles which are opposite the ends of the said armature.

My invention will be more readily understood by reference to theaccompanying drawing in which- Fig. l is a front elevation of apolarized ringer embodying my invention; Fig. 2 is a fragmentarysectional view showing the manner of mounting-the armature with themeans for adjusting the position thereof; Fig. 3 is a plan on sectionline 3-3 of Fig. 2, showing the link piece and the manner in which the-bridge carrying the armature is mounted thereon; Fig. 4 is aperspective view of the link showing a. modification which consists inshearing tongues therein; Fig. 5 is a fragmentary side elevation showingthe armature mounting; Fig. G is a view taken upon section line 6-6 ofFig. l. Fig. 7 is a side elevation of the link piece showing thecurvature therein.

Like parts are indicatedby similar charaeters of reference in thedierent figures.

The ringer is provided with a permanent magnetl and with anelectromagnet 2, consisting of two spools 3 and 4 joined by a suitableyoke 30. The poles 5 and G project as indicated and are provided withsuitable annular grooves 7 and 8 which serve to support the mounting ofthe arma-ture 9. This mount-ing comprises the forked or slotted brassplate 10 forming the link, the bridge 1l of spring metal with its curvedand projecting ends engaging'and resting upon the outer ends of thetangs of the link, and the screw 12. The screw 12 passes through thecentral portion of the bridge, the perforation 13 provided in thearmature and into the central part of the link which is tapped toreceive tie said screw. The end of the steel magnet is perforated at 14opposite the head of said screw as shown, to afford convenient accessthereto by means'of a screw!4 driver. The spring bridgel as stamped outis provided with ears 1G and 17 in which are inserted the screws 1S and19 upon which the armature is pivoted. Y

The ends or tangs 'of the plate or link 10 may be sprungor bentslightly, so that when inserted in t ie grooves 7 .and 8 and the spools3 and 4 are screwed downto the hee-l piece and the spools take parallelpositions, the tangsi are firmly engaged by the sides of the slots 7, 8;or the link 10, which is made slightly iiexible, may be provided withweakcned portions or tongues, as shown in Fig. 4,

so that when it is inserted in place upon the extensions of the coresand the screw 12 is tightened, the pull upon the central part of thelink 10' will cause the tangs or forks to be deflected in such a way asto bring them against the inner faces of the' grooves and at the sametime the tongues 20, 21 are drawn against the outer faces of thegrooves, thereby binding the said link securely to the cores. Afterhaving thus been secured to the cores any further tightening of thescrew 12 results only in fiexing the bridge and bringing the armaturenearer the poles, or vice versa.

It will be observed that the screw 12 holds the ends of the springbridge in fixed position with relation to, and in engagement with, theprojecting ends or tangs of the link. The ear or lug 17 of said bridgevrests between shoulders or projections 22, 23 of the link, which thusserve as a guide for said lug, and at the same time prevent lateralmovement of the bridge when flexed by turning the screw. The bridge or-U-shaped member is thus held in engagement with the forks at the ends ofthe link, and the ear 17,

which is provided upon the bridge, is adapted to be moved with relationto the link as the bridge is iiexed to adjust the position ofv thearmature with respect to the poles of the electromagnet.

Having thus described my invention, I claim as new and desire to secureby Letters Patent: v

-1. The combination'of a pair of magnet coils, cores therefor, a linkextending between said cores, a resilient bridge engaging said link, anarmature carried by said bridge, and means for holding said bridge inplace and adjusting the position of saidarmature relative to said Coresby flexing said bridge. l

2. The combination of a. pair of cores having pole extensions, magnetcoils thereon, a link interconnecting said pole extensions, a resilientbridge coperating with said link, an armature carried by said bridge,and means cooperating with said bridge and said link for regulating theposition of said armature by flexing said bridge.

'3. The combination of a pair of magnet spools having core extensions,of a link secured to and extending beyond said core extensions, anadjustable bridge engaging the ends of said link, an armature carried bysaid bridge, and means at the center of said bridge for holding the samein engagement ineens? withsaid link and for adjusting the position ofsaid bridge.

Ll. The combination with a pair of magnet spools having core extensionsformed with annular slots, of`a forked link carried in said slots, anarmature, a support for said armature interlocked with the prongs ofsaid forked link, and means for adjusting the armature support withrespect to the cores.

5. The combination with a pair of magnet spools having core extensionsformed with annular slots, of a forked link carried in said slots, anarmature, a flexible bridge for supporting said armature mounted uponthe prongs of said link, and means for`7 flexing said bridge and therebyadjusting the armature with respect to the cores.

6. The combination with a pair of magnet spools having cor-e extensionsformed with annular slots, of two parts, one of which is flexible andthe other comparatively rigid, one of said parts being formed withforked ends adapted to engage said slots and the other being adapted tointerlock with said forked ends, any armature carried by the ilexiblepart, and means whereby the armaturecarrying part may be flexed toadjust said armature with respect to the cores.

7. In a polarized ringer, the combination with the magnet spools havingannularly slotted core extensions, of a link having forked 'endsengaging the annular slots in Vsaid core extensions, a bridge adapted toengage with the prongs of said link, whereby said bridge is bothsupported and positioned by said prongs, an armature carried by saidbridge, and a screw engaging said'bridge and link for adjusting saidarmature withv respect to said cores.

8. In a ringer, the combination with th magnet. spools, of a heel piecetherefor, a forked .link having its prongs bent out of the plane of thebody portion and carried in annular slots in the free ends of the coresof said magnet spools, said prongs being adapted to be firmly clamped insaid slots by said spools when the same are secured to said heel piece,and an armature supported in operative relation to the free ends of thecores of said magnet spools.

In witness whereof, l hereunto subscribe' my name this 1st day lof MayA.. D., 1908. lElllleiltl) B. CRAFT..

lWitnesses Bonnin? E. lVILLIAMs, el. il. Lyne.

